package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Override
    public List<ShoppingCart> list() {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        return shoppingCartMapper.list();
    }

    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        // 设置用户ID
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        
        // 查询当前用户购物车中是否已经存在该菜品或套餐
        List<ShoppingCart> list = shoppingCartMapper.getByShoppingCart(shoppingCart);
        
        if(list != null && list.size() > 0){
            // 如果已经存在，就更新数量
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            // 如果不存在，需要插入一条购物车数据
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                // 本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                // 本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.add(shoppingCart);
        }
    }

    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart Shoppingcart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,Shoppingcart);
        Long userId = BaseContext.getCurrentId();
        Shoppingcart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.getByShoppingCart(Shoppingcart);
        ShoppingCart cart = list.get(0);
            if(cart.getNumber() > 1){
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
            } else {
                shoppingCartMapper.delete(cart.getId());
            }
    }

    @Override
    public void clean() {
        shoppingCartMapper.cleanAll(BaseContext.getCurrentId());
    }
}
